Never do RPCs during an xact like this! Fastest way to lock up your DB. I don't even mean at large scale. I've been forced many times to set up two-phase commit

Never do RPCs during an xact like this! Fastest way to lock up your DB. I don't even mean at large scale. I've been forced many times to set up two-phase commit. That way you also get more flexibility and visibility into what it's doing.